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24#include <linux/module.h>
25#include <linux/init.h>
26#include <linux/interrupt.h>
27#include <linux/types.h>
28#include <linux/input.h>
29#include <linux/kernel.h>
30#include <linux/delay.h>
31#include <linux/platform_device.h>
32#include <linux/errno.h>
33#include <linux/slab.h>
34
35#include <asm/irq.h>
36
37#include <mach/hardware.h>
38#include <mach/irqs.h>
39#include <linux/platform_data/keyscan-davinci.h>
40
41
42#define DAVINCI_KEYSCAN_KEYCTRL 0x0000
43#define DAVINCI_KEYSCAN_INTENA 0x0004
44#define DAVINCI_KEYSCAN_INTFLAG 0x0008
45#define DAVINCI_KEYSCAN_INTCLR 0x000c
46#define DAVINCI_KEYSCAN_STRBWIDTH 0x0010
47#define DAVINCI_KEYSCAN_INTERVAL 0x0014
48#define DAVINCI_KEYSCAN_CONTTIME 0x0018
49#define DAVINCI_KEYSCAN_CURRENTST 0x001c
50#define DAVINCI_KEYSCAN_PREVSTATE 0x0020
51#define DAVINCI_KEYSCAN_EMUCTRL 0x0024
52#define DAVINCI_KEYSCAN_IODFTCTRL 0x002c
53
54
55#define DAVINCI_KEYSCAN_KEYEN 0x00000001
56#define DAVINCI_KEYSCAN_PREVMODE 0x00000002
57#define DAVINCI_KEYSCAN_CHATOFF 0x00000004
58#define DAVINCI_KEYSCAN_AUTODET 0x00000008
59#define DAVINCI_KEYSCAN_SCANMODE 0x00000010
60#define DAVINCI_KEYSCAN_OUTTYPE 0x00000020
61
62
63#define DAVINCI_KEYSCAN_INT_CONT 0x00000008
64#define DAVINCI_KEYSCAN_INT_OFF 0x00000004
65#define DAVINCI_KEYSCAN_INT_ON 0x00000002
66#define DAVINCI_KEYSCAN_INT_CHANGE 0x00000001
67#define DAVINCI_KEYSCAN_INT_ALL 0x0000000f
68
69struct davinci_ks {
70 struct input_dev *input;
71 struct davinci_ks_platform_data *pdata;
72 int irq;
73 void __iomem *base;
74 resource_size_t pbase;
75 size_t base_size;
76 unsigned short keymap[];
77};
78
79
80static int __init davinci_ks_initialize(struct davinci_ks *davinci_ks)
81{
82 struct device *dev = &davinci_ks->input->dev;
83 struct davinci_ks_platform_data *pdata = davinci_ks->pdata;
84 u32 matrix_ctrl;
85
86
87 __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
88 davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
89
90
91 __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
92 davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
93
94
95 __raw_writel(pdata->strobe,
96 davinci_ks->base + DAVINCI_KEYSCAN_STRBWIDTH);
97 __raw_writel(pdata->interval,
98 davinci_ks->base + DAVINCI_KEYSCAN_INTERVAL);
99 __raw_writel(0x01,
100 davinci_ks->base + DAVINCI_KEYSCAN_CONTTIME);
101
102
103 switch (pdata->matrix_type) {
104 case DAVINCI_KEYSCAN_MATRIX_4X4:
105 matrix_ctrl = 0;
106 break;
107 case DAVINCI_KEYSCAN_MATRIX_5X3:
108 matrix_ctrl = (1 << 6);
109 break;
110 default:
111 dev_err(dev->parent, "wrong matrix type\n");
112 return -EINVAL;
113 }
114
115
116 __raw_writel(DAVINCI_KEYSCAN_AUTODET | DAVINCI_KEYSCAN_KEYEN |
117 matrix_ctrl, davinci_ks->base + DAVINCI_KEYSCAN_KEYCTRL);
118
119 return 0;
120}
121
122static irqreturn_t davinci_ks_interrupt(int irq, void *dev_id)
123{
124 struct davinci_ks *davinci_ks = dev_id;
125 struct device *dev = &davinci_ks->input->dev;
126 unsigned short *keymap = davinci_ks->keymap;
127 int keymapsize = davinci_ks->pdata->keymapsize;
128 u32 prev_status, new_status, changed;
129 bool release;
130 int keycode = KEY_UNKNOWN;
131 int i;
132
133
134 __raw_writel(0x0, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
135
136
137 prev_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_PREVSTATE);
138 new_status = __raw_readl(davinci_ks->base + DAVINCI_KEYSCAN_CURRENTST);
139
140 changed = prev_status ^ new_status;
141
142 if (changed) {
143
144
145
146
147 for (i = 0 ; i < keymapsize; i++) {
148 if ((changed>>i) & 0x1) {
149 keycode = keymap[i];
150 release = (new_status >> i) & 0x1;
151 dev_dbg(dev->parent, "key %d %s\n", keycode,
152 release ? "released" : "pressed");
153 input_report_key(davinci_ks->input, keycode,
154 !release);
155 input_sync(davinci_ks->input);
156 }
157 }
158
159 __raw_writel(DAVINCI_KEYSCAN_INT_ALL,
160 davinci_ks->base + DAVINCI_KEYSCAN_INTCLR);
161 }
162
163
164 __raw_writel(0x1, davinci_ks->base + DAVINCI_KEYSCAN_INTENA);
165
166 return IRQ_HANDLED;
167}
168
169static int __init davinci_ks_probe(struct platform_device *pdev)
170{
171 struct davinci_ks *davinci_ks;
172 struct input_dev *key_dev;
173 struct resource *res, *mem;
174 struct device *dev = &pdev->dev;
175 struct davinci_ks_platform_data *pdata = dev_get_platdata(&pdev->dev);
176 int error, i;
177
178 if (pdata->device_enable) {
179 error = pdata->device_enable(dev);
180 if (error < 0) {
181 dev_dbg(dev, "device enable function failed\n");
182 return error;
183 }
184 }
185
186 if (!pdata->keymap) {
187 dev_dbg(dev, "no keymap from pdata\n");
188 return -EINVAL;
189 }
190
191 davinci_ks = kzalloc(sizeof(struct davinci_ks) +
192 sizeof(unsigned short) * pdata->keymapsize, GFP_KERNEL);
193 if (!davinci_ks) {
194 dev_dbg(dev, "could not allocate memory for private data\n");
195 return -ENOMEM;
196 }
197
198 memcpy(davinci_ks->keymap, pdata->keymap,
199 sizeof(unsigned short) * pdata->keymapsize);
200
201 key_dev = input_allocate_device();
202 if (!key_dev) {
203 dev_dbg(dev, "could not allocate input device\n");
204 error = -ENOMEM;
205 goto fail1;
206 }
207
208 davinci_ks->input = key_dev;
209
210 davinci_ks->irq = platform_get_irq(pdev, 0);
211 if (davinci_ks->irq < 0) {
212 dev_err(dev, "no key scan irq\n");
213 error = davinci_ks->irq;
214 goto fail2;
215 }
216
217 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
218 if (!res) {
219 dev_err(dev, "no mem resource\n");
220 error = -EINVAL;
221 goto fail2;
222 }
223
224 davinci_ks->pbase = res->start;
225 davinci_ks->base_size = resource_size(res);
226
227 mem = request_mem_region(davinci_ks->pbase, davinci_ks->base_size,
228 pdev->name);
229 if (!mem) {
230 dev_err(dev, "key scan registers at %08x are not free\n",
231 davinci_ks->pbase);
232 error = -EBUSY;
233 goto fail2;
234 }
235
236 davinci_ks->base = ioremap(davinci_ks->pbase, davinci_ks->base_size);
237 if (!davinci_ks->base) {
238 dev_err(dev, "can't ioremap MEM resource.\n");
239 error = -ENOMEM;
240 goto fail3;
241 }
242
243
244 if (pdata->rep)
245 __set_bit(EV_REP, key_dev->evbit);
246
247
248 __set_bit(EV_KEY, key_dev->evbit);
249
250
251 davinci_ks->pdata = pdata;
252
253 for (i = 0; i < davinci_ks->pdata->keymapsize; i++)
254 __set_bit(davinci_ks->pdata->keymap[i], key_dev->keybit);
255
256 key_dev->name = "davinci_keyscan";
257 key_dev->phys = "davinci_keyscan/input0";
258 key_dev->dev.parent = &pdev->dev;
259 key_dev->id.bustype = BUS_HOST;
260 key_dev->id.vendor = 0x0001;
261 key_dev->id.product = 0x0001;
262 key_dev->id.version = 0x0001;
263 key_dev->keycode = davinci_ks->keymap;
264 key_dev->keycodesize = sizeof(davinci_ks->keymap[0]);
265 key_dev->keycodemax = davinci_ks->pdata->keymapsize;
266
267 error = input_register_device(davinci_ks->input);
268 if (error < 0) {
269 dev_err(dev, "unable to register davinci key scan device\n");
270 goto fail4;
271 }
272
273 error = request_irq(davinci_ks->irq, davinci_ks_interrupt,
274 0, pdev->name, davinci_ks);
275 if (error < 0) {
276 dev_err(dev, "unable to register davinci key scan interrupt\n");
277 goto fail5;
278 }
279
280 error = davinci_ks_initialize(davinci_ks);
281 if (error < 0) {
282 dev_err(dev, "unable to initialize davinci key scan device\n");
283 goto fail6;
284 }
285
286 platform_set_drvdata(pdev, davinci_ks);
287 return 0;
288
289fail6:
290 free_irq(davinci_ks->irq, davinci_ks);
291fail5:
292 input_unregister_device(davinci_ks->input);
293 key_dev = NULL;
294fail4:
295 iounmap(davinci_ks->base);
296fail3:
297 release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
298fail2:
299 input_free_device(key_dev);
300fail1:
301 kfree(davinci_ks);
302
303 return error;
304}
305
306static int davinci_ks_remove(struct platform_device *pdev)
307{
308 struct davinci_ks *davinci_ks = platform_get_drvdata(pdev);
309
310 free_irq(davinci_ks->irq, davinci_ks);
311
312 input_unregister_device(davinci_ks->input);
313
314 iounmap(davinci_ks->base);
315 release_mem_region(davinci_ks->pbase, davinci_ks->base_size);
316
317 kfree(davinci_ks);
318
319 return 0;
320}
321
322static struct platform_driver davinci_ks_driver = {
323 .driver = {
324 .name = "davinci_keyscan",
325 },
326 .remove = davinci_ks_remove,
327};
328
329module_platform_driver_probe(davinci_ks_driver, davinci_ks_probe);
330
331MODULE_AUTHOR("Miguel Aguilar");
332MODULE_DESCRIPTION("Texas Instruments DaVinci Key Scan Driver");
333MODULE_LICENSE("GPL");
334
